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Name: _________________________Date: __________________ Lab: The Structure of a Frog LegIntroduction:Similar in some respects to the human leg, a frog leg is composed of numerous different cells, tissue, and organs. These body parts interact and cooperate to allow a frog to perform a variety of activities such as jumping, leaping, and sitting. In this investigation, the various tissues and structures of the leg will be located and described.Materials:Frog legDissecting panScalpelForcepsDissecting probePaper towelRubber glovesProcedure:Place a frog leg in your dissecting pan. Examine the skin of the frog. What does it look like?What protein in the skin is contributing to the color?CAUTION: Scalpels are very sharp! Carefully remove the skin by cutting a superficial incision down the inner thigh and peeling the skin back. Be careful not to cut too deep and disturb underlying muscle tissue. Yellow masses may be found on the inside surface of the skin.What type of tissue are these masses?Once the skin has been pulled back, examine all of the muscle on the frog leg. Be sure to identify all of the muscles in the given diagram. Place a check mark by the muscles you are able to view and determine whether they are also located in the human body.Frog Muscles:Found in the Human Body?Adductor longus Triceps femoris Adductor Magnus SartoriusSemimemranosusGracilis majorGastrocnemiusIliotibularisPeroneusTibialis longusAchilles TendonObserve the tough white tissue that is found at both ends of the muscle. It extends from the muscle ends to the bone. That tissue is called a tendon.With a scalpel, carefully cut out the triceps femoris with its tendons and set it aside in the dissecting pan. Make a diagram of the muscle with its tendons and label each of them.Observe the thin white tissue that covers the muscle. This is connective tissue, or the fascia. Is the connective tissue firmly or loosely attached to the muscle? Carefully remove all the muscles and tendons using the same procedure as you did in step 5. Carefully look for the blood vessels. These are thick, red, threadlike strands. Also look for nerves. Nerves are thin, white threadlike strands that are found nearest the bones. How do the diameters of the nerves and blood vessels compare?Your frog leg should now have all the muscles and tendons removed. Use your scalpel to clear away any muscles or tendons remaining.Examine the joints. The ligaments are tough, white tissue holding the two bones together. With your hands, try to break the ligaments and separate the bones that connect the thigh and the lower leg. Do the bones separate easily? _________________________________________Conclusion/Analysis:The meat of the leg and thigh consists of what type of tissue? When you eat a chicken leg what type of cells are you actually eating?In what ways are muscle and bones similar? Different?In what ways are tendons and ligaments similar? Different?Muslces of the frog legMuscles of the human leg ................
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